/**
 * 
 * Copyright (C) 2011 Cody Stoutenburg . All rights reserved.
 *
 *       This program is free software; you can redistribute it and/or
 *       modify it under the terms of the GNU Lesser General Public License
 *       as published by the Free Software Foundation; either version 2.1
 *       of the License, or (at your option) any later version.
 *
 *       This program is distributed in the hope that it will be useful,
 *       but WITHOUT ANY WARRANTY; without even the implied warranty of
 *       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *       GNU Lesser General Public License for more details.
 *
 *       You should have received a copy of the GNU Lesser General Public License
 *       along with this program; if not, write to the Free Software
 *       Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. 
 * 
 */
package ca.usherbrooke.tools;

/**
 * This class allow to have an unique instance for the class easily.<br/>
 * you need to extends this class and we will insure that the instance will be
 * unique, if you do not override <code>equals</code> and <code>hashcode</code>
 * 
 * @author Cody Stoutenburg
 * 
 */
public class GUID implements IGUID {
	private static final long serialVersionUID = 1L;
	private static Long CURRENT_GUID = 0L;

	private final long guid;

	public GUID() {
		guid = CURRENT_GUID;
		++CURRENT_GUID;
	}

	@Override
	public Long getGuid() {
		return guid;
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + (int) (guid ^ (guid >>> 32));
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		GUID other = (GUID) obj;
		if (guid != other.guid)
			return false;
		return true;
	}
}
